复数模板

问题：

【项目6-复数模板类】
    阅读教材例10.1。该例实现了一个复数类，但是美中不足的是，复数类的实部和虚部都固定只能是double型的。可以通过模板类的技术手段，设计Complex，使实部和虚部的类型为定义对象时指定的实际类型。
    （1）要求类成员函数在类外定义。
    （2）在此基础上，再实现减法、乘法和除法
 代码：

#include <iostream>

using namespace std;

template  <class t>
class Complex
{
public:
    Complex()
    {
        real=0;
        imag=0;
    }
    Complex(t r,t i)
    {
        real=r;
        imag=i;
    }
    Complex complex_add(Complex &c2);
    Complex complex_minus(Complex &c2);
    Complex complex_multiply(Complex &c2);
    Complex complex_divide(Complex &c2);
    void display();
private:
    t real;
    t imag;
};
template <class t>
Complex<t> Complex<t>::complex_add(Complex<t> &c2)
{
    Complex<t> c;
    c.real=real+c2.real;
    c.imag=imag+c2.imag;
    return c;
}
template <class t>
Complex<t> Complex<t>::complex_minus(Complex<t> &c2)
{
    Complex<t> c;
    c.real=real-c2.real;
    c.imag=imag-c2.imag;
    return c;
}
template<class t>
Complex<t> Complex<t>::complex_divide(Complex<t> &c2)
{
    Complex <t> c;
    t d=c2.real*c2.real+c2.imag*c2.imag;
    c.real=(real*c2.real+imag*c2.imag)/d;       //此处有危险未排除：除法溢出
    c.imag=(imag*c2.real-real*c2.imag)/d;
    return c;
}
template <class t>
Complex<t> Complex<t>::complex_multiply(Complex <t> &c2)
{
    Complex <t> c;
    c.real=real*c2.real-imag*c2.imag;
    c.imag=imag*c2.real+real*c2.imag;
    return c;
}

template<class t>
void Complex<t>::display( )
{
    cout<<"("<<real<<","<<imag<<"i)"<<endl;
}

int main( )
{
    Complex<int> c1(3,4),c2(5,-10),c3; //定义对象时，用“类模板名<实际类型名>”形式

    cout<<"c1=";
    c1.display( );

    cout<<"c2=";
    c2.display( );

    c3=c1.complex_add(c2);
    cout<<"c1+c2=";
    c3.display( );

    c3=c1.complex_minus(c2);
    cout<<"c1-c2=";
    c3.display( );

    c3=c1.complex_multiply(c2);
    cout<<"c1*c2=";
    c3.display( );

    c3=c1.complex_divide(c2);
    cout<<"c1/c2=";
    c3.display( );

    cout<<endl;

    Complex<double> c4(3.1,4.4),c5(5.34,-10.21),c6; //定义对象时，用“类模板名<实际类型名>”形式

    cout<<"c4=";
    c4.display( );

    cout<<"c5=";
    c5.display( );

    c6=c4.complex_add(c5);
    cout<<"c4+c5=";
    c6.display( );

    c6=c4.complex_minus(c5);
    cout<<"c4-c5=";
    c6.display( );

    c6=c4.complex_multiply(c5);
    cout<<"c4*c5=";
    c6.display( );


    c6=c4.complex_divide(c5);
    cout<<"c4/c5=";
    c6.display( );

    return 0;
}

运行结果：